12440231 has 4 divisors (see below), whose sum is σ = 13095000. Its totient is φ = 11785464.

The previous prime is 12440227. The next prime is 12440249. The reversal of 12440231 is 13204421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12440231 - 2² = 12440227 is a prime.

It is a super-2 number, since 2×12440231² = 309518694666722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327356 + ... + 327393.

It is an arithmetic number, because the mean of its divisors is an integer number (3273750).

Almost surely, 2^12440231 is an apocalyptic number.

12440231 is a deficient number, since it is larger than the sum of its proper divisors (654769).

12440231 is an equidigital number, since it uses as much as digits as its factorization.

12440231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654768.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 12440231 is about 3527.0711645783. The cubic root of 12440231 is about 231.7089530548.

Adding to 12440231 its reverse (13204421), we get a palindrome (25644652).

The spelling of 12440231 in words is "twelve million, four hundred forty thousand, two hundred thirty-one".